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TCR microclusters form spatially segregated domains and sequentially assemble in calcium-dependent kinetic steps

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Listed:
  • Jason Yi

    (National Institutes of Health)

  • Lakshmi Balagopalan

    (National Institutes of Health)

  • Tiffany Nguyen

    (National Institutes of Health)

  • Katherine M. McIntire

    (National Institutes of Health)

  • Lawrence E. Samelson

    (National Institutes of Health)

Abstract

Engagement of the T cell receptor (TCR) by stimulatory ligand results in the rapid formation of microclusters at sites of T cell activation. Whereas microclusters have been studied extensively using confocal microscopy, the spatial and kinetic relationships of their signaling components have not been well characterized due to limits in image resolution and acquisition speed. Here we show, using TIRF-SIM to examine the organization of microclusters at sub-diffraction resolution, the presence of two spatially distinct domains composed of ZAP70-bound TCR and LAT-associated signaling complex. Kinetic analysis of microcluster assembly reveal surprising delays between the stepwise recruitment of ZAP70 and signaling proteins to the TCR, as well as distinct patterns in their disassociation. These delays are regulated by intracellular calcium flux downstream of T cell activation. Our results reveal novel insights into the spatial and kinetic regulation of TCR microcluster formation and T cell activation.

Suggested Citation

  • Jason Yi & Lakshmi Balagopalan & Tiffany Nguyen & Katherine M. McIntire & Lawrence E. Samelson, 2019. "TCR microclusters form spatially segregated domains and sequentially assemble in calcium-dependent kinetic steps," Nature Communications, Nature, vol. 10(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-018-08064-2
    DOI: 10.1038/s41467-018-08064-2
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    Cited by:

    1. Darren B. McAffee & Mark K. O’Dair & Jenny J. Lin & Shalini T. Low-Nam & Kiera B. Wilhelm & Sungi Kim & Shumpei Morita & Jay T. Groves, 2022. "Discrete LAT condensates encode antigen information from single pMHC:TCR binding events," Nature Communications, Nature, vol. 13(1), pages 1-18, December.
    2. Edward Jenkins & Markus Körbel & Caitlin O’Brien-Ball & James McColl & Kevin Y. Chen & Mateusz Kotowski & Jane Humphrey & Anna H. Lippert & Heather Brouwer & Ana Mafalda Santos & Steven F. Lee & Simon, 2023. "Antigen discrimination by T cells relies on size-constrained microvillar contact," Nature Communications, Nature, vol. 14(1), pages 1-21, December.
    3. Rachel Drawbond & Kathrin Spendier, 2019. "TIRF Microscope Image Sequences of Fluorescent IgE-FcεRI Receptor Complexes inside a FcεRI-Centric Synapse in RBL-2H3 Cells," Data, MDPI, vol. 4(3), pages 1-11, July.

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